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Resurfacing drums info

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  • Resurfacing drums info

    I have an ammco 4000 brake lathe,
    resurfacing / truing the front drums is no problem as the 1" arbor and standard race adapters work beautiful. The issue is the rear drums as the 1" arbor will not slide through the end of the hub because it has a 3/4" opening. After doing a little research i found that ammco sells an 11/16th" arbor which comes with all needed accy's. This setup will adapt to any ammco Models 2002, 3000, 4000, 4100, 7000, 7700 brake lathes. So for anyone looking to be able to do the rear drums a brake doktor is not needed. these ammco machines are easily available used and for good prices. Just thought i would post this info as i hope it can help.
    The part # for the kit is 9708 and i found the cheapest place to buy it from with free shipping, and dropped shipped from ammco, so it only took a few days to get

    3 ~ Tudor's
    Henry Ford said
    "It's all nuts and bolts"

    Mitch's Auto Service ctr

  • #2
    WAAAH, I only had a piddly AMCO 2000, but it had the adaptor you show. I made lots of $$$$$s with it, doing drop off DRUMS/ROTORS.
    Dad Poor


    • #3
      Mitch good to know you have the machine that can cut rear drums. Some of the new cast iron drums need to have 1 more finish cut.
      1928 speedster
      1929 closed cab p/u
      1930 standard roadster
      1931 deluxe tudor sedan
      1967 ss/rs conv.camaro


      • #4
        When I did the brakes on my 62 Chevy I was able to turn the drums on my 12" Atlas lathe. I remember using an Ammco at the GM dealership I worked at in the 70's, and it was a nice machine. A few times I'd hit hard spots in the drums. I'm not sure what caused them, but they sure needed a sharp new carbide to clean them up.


        • #5
          I've noticed hard spots in just about any metal I have ever worked with. I just had to machine a billet (2x2x12) of 1045 Tool steel to make a brake arm for my '47 Stude M5 project and was a little surprised that it too had hard spots. I guess no alloy is totally uniform


          • #6
            Hard spots or glazed spots in the drum. These are caused by excessive heat that brings about metallurgical changes in the metal. Hard spots can be identified by raised or discolored patches on the drum friction surface. Hard spots can cause chatter, pedal pulsation and grabbing when the brakes are applied.
            3 ~ Tudor's
            Henry Ford said
            "It's all nuts and bolts"

            Mitch's Auto Service ctr


            • #7
              SOME lathes have a GRINDING attachment, that does well on HARD spots.
              OH, spade the GRINDINGS/CUTTINGS around your ROSES & you can SHOW your blossoms (REALLY!)
              Dad Hortiguru
              Last edited by BILL WILLIAMSON; 07-07-2017, 09:27 PM.


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